Beach
Guides
Agrilus obsoletoguttatus
Beech Borer
Agrilus obsoletoguttatus is a small metallic wood-boring beetle in the family Buprestidae, native to North America. It is among the smallest jewel beetle species utilized as prey by the specialist predatory wasp Cerceris fumipennis, which provisions its underground nests with paralyzed buprestid beetles. The species has been documented in nest caches containing up to 13 individuals, reflecting its small size relative to larger buprestid prey.
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littoralis
beach wolf spider, shoreline wolf spider
Arctosa littoralis, commonly known as the beach wolf spider or shoreline wolf spider, is a species of wolf spider in the family Lycosidae. It is a medium-sized spider (11-15 mm body length) with highly effective camouflage coloration adapted to sandy habitats. The species ranges throughout North and Central America, where it inhabits beaches, dunes, stream banks, and other sandy environments. It is primarily nocturnal and can be located at night by the distinctive blue-green eyeshine produced when light reflects from its tapetum lucidum.
Habroscelimorpha dorsalis
Eastern Beach Tiger Beetle
Habroscelimorpha dorsalis, the eastern beach tiger beetle, is a coastal tiger beetle species found on sandy beaches along the Atlantic and Gulf coasts of North America, ranging from the northeastern United States through Florida and into Mexico. Adults are active during summer months, foraging in intertidal zones for small invertebrates. The species has a two-year life cycle with larvae that construct vertical burrows in beach sand. One subspecies, H. d. dorsalis (Northeastern beach tiger beetle), is federally listed as threatened due to habitat loss from coastal development and recreational disturbance.
Habroscelimorpha dorsalis dorsalis
Northeastern Beach Tiger Beetle
The Northeastern Beach Tiger Beetle is the largest subspecies of Habroscelimorpha dorsalis, endemic to sandy Atlantic coast beaches of the northeastern United States. Listed as threatened under the U.S. Endangered Species Act since 1990, this diurnal predator has experienced severe population declines due to habitat loss from coastal erosion, shoreline development, and human recreational activity. Adults are active from mid-June through July, while larvae overwinter in deep sand burrows. The species serves as an indicator of beach ecosystem health and requires specific habitat conditions including medium-coarse sand and minimum beach widths of 6.5 feet for successful reproduction.
Opilidia chlorocephala smythi
Smyth's Beach Tiger Beetle
A subspecies of beach tiger beetle in the family Cicindelidae. Belongs to the genus Opilidia, which contains species adapted to sandy coastal and riparian habitats. The subspecies was described by E.D. Harris in 1913.
Parathalassius
Parathalassius is a genus of long-legged flies in the family Dolichopodidae, subfamily Parathalassiinae. The genus name derives from Greek, meaning 'near the sea', reflecting its strict association with coastal habitats. The genus comprises 15 recognized species distributed across the Palaearctic and Nearctic realms, with nine species described from the Nearctic Region in a 2017 revision. Species are restricted to sandy marine coastlines, where they occupy beach and dune ecosystems.
Parathalassius uniformus
Parathalassius uniformus is a species of long-legged fly described from the Nearctic region in 2017. The species was established during a comprehensive revision of the genus Parathalassius, which included morphological phylogenetic analysis and COI mitochondrial DNA barcoding. It is one of twelve Nearctic species in the genus, nine of which were newly described in the same revision. The genus Parathalassius is associated with sandy coastal habitats.
Terralonus californicus
Intertidal Jumping Spider, Beach Jumping Spider
Terralonus californicus is a jumping spider in the family Salticidae, notable as one of the few spider species known to regularly inhabit coastal beach environments. It is found in the United States, primarily along the Pacific coast. The species has been documented through over 750 observations on iNaturalist, indicating it is relatively well-observed among coastal arachnids. Its intertidal habitat distinguishes it from most other jumping spiders, which typically occupy terrestrial vegetation and ground habitats.
Tylos
Calloused Beach Pillbugs
Tylos is a genus of terrestrial isopods (woodlice) in the family Tylidae, commonly known as calloused beach pillbugs. These crustaceans are specialized inhabitants of sandy coastal environments, living in the supralittoral zone above the driftline on ocean beaches. They exhibit remarkable adaptations for life in this harsh habitat, including powerful burrowing abilities, strong desiccation resistance, and behavioral synchronization with tidal and diel cycles. Most species are nocturnal, emerging at night to feed on beach-cast organic material such as kelp and other detritus.
Tylos niveus
Snowy Calloused Beach Pillbug
Tylos niveus is a coastal isopod in the family Tylidae, first described by Budde-Lund in 1885. A 2000 redescription provided a new diagnosis for the species and documented its expanded latitudinal distribution. The species has been recorded from sandy beach habitats in Brazil, with a new occurrence reported from Taquaras, Santa Catarina, extending its known range to 27°S.